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The Journal of Immunology, Vol 154, Issue 11 5799-5805, Copyright © 1995 by American Association of Immunologists

ARTICLES

Mapping of genes controlling quantitative antibody production in Biozzi mice

A Puel, PC Groot, MG Lathrop, P Demant and D Mouton
CNRS ERS 27, Biology Section, Curie Institute, Paris, France.

An extensive search for in vivo immunomodulatory genes (Im genes) was made, using highly polymorphic DNA markers (microsatellites), in F2 hybrids between the two lines of mice selected for high (H) or low (L) Ab production (Biozzi mice). H and L mice have extreme phenotypes resulting from the accumulation, during selective breeding, of genes endowed with, respectively, upward or downward additive effects on Ab production. A total genome screening with 90 microsatellite markers (polymorphic between H and L mice) was conducted in 60 F2 hybrids sorted out for their extreme phenotypes from an immunized population of 240 individuals. A difference in parental marker frequency between these two groups (measured by a chi2 test) reveals the presence of an Im gene close to the marker. Significant chi2 scores were indeed found in two regions corresponding to the MHC and Igh loci, already identified as partly contributing to the H/L phenotypic difference. A notable finding was the demonstration that a gene(s), located on the proximal part of chromosome 6, was linked with Ab responsiveness. Other markers at distinct chromosomal regions also give increased chi2 scores, the two regions most clearly pointed out being on chromosomes 4 and 8.


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